package com.zqh.countDownLatch;

import java.util.concurrent.CountDownLatch;

/**
 * @author 曾庆红
 * {@code @date} 2023-10-14 11:22
 * CountDownLatch 的使用方法
 */

public class T1 {
    public static void main(String[] args) {
        usingJoin();
        usingCountDownLatch();
    }
    private static void usingCountDownLatch(){
        Thread[] threads = new Thread[100];
        CountDownLatch latch = new CountDownLatch(threads.length);
        for(int i = 0; i< threads.length; i++){
            threads[i] = new Thread(()->{
                int result = 0;
                for(int j = 0; j<10000; j++) result += j;
                latch.countDown();
            });
        }
        for(int i = 0; i<threads.length; i++){
            threads[i].start();
        }
        try{
            latch.await();
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println("end latch");
    }
    private static  void usingJoin(){
        Thread[] threads = new Thread[100];
        for(int i = 0; i<threads.length; i++){
            threads[i] = new Thread(()->{
               int result = 0;
               for (int j = 0; j<10000; j++) result+=j;
            });
        }
        for (int i = 0; i<threads.length; i++){
            threads[i].start();
        }
        for(int i = 0; i<threads.length; i++){
            try {
                threads[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("join end");
    }
}
